shlink/config/autoload/mercure.global.php

<?php

declare(strict_types=1);

return [

    'mercure' => [
        'public_hub_url' => null,
        'internal_hub_url' => null,
        'jwt_secret' => null,
        'jwt_days_duration' => 5,
        'jwt_issuer' => 'Shlink',
    ],

];